Affiliation:
1. School of Chemical Engineering Changchun University of Technology 2055 Yanan Street Changchun 130012 P. R.China
2. Key Laboratory of Advanced Functional Polymer Membrane Materials of Jilin Province 2055 Yanan Street Changchun 130012 P. R.China
3. College of Chemistry Chemical Engineering and Materials Science Zaozhuang University Zaozhuang, Shandong 277160 China
4. Jilin Jinsai Technology Development Co., Ltd. Jilin 132031 China
Abstract
AbstractPreparing asymmetric pervaporation membranes is a kind of promising method to enhance pervaporation membrane flux. Hydrophobic PVDF polymer can be used to prepare asymmetric pervaporation membranes, but its separation factor is relatively low. In this work, to improve the performance of PVDF membrane pervaporation, PDMS polymer was added to the PVDF membrane, and asymmetric PDMS/PVDF permeable membranes were prepared by the non‐solvent induced phase separation (NIPS) method. The effects of mass ratios of PDMS to PVDF on the membrane structures and the membrane properties were characterized by SEM, XRD, FTIR, TGA, water contact angle and mechanical strength. The results showed that the ratios of the PDMS: PVDF affect its phase‐separation behavior. As the addition of PDMS increased, the finger‐like pores on the membrane section gradually became longer, the upper surface changed from less porous to porous structure, and the lower surface structure changed from interconnected flocculent structure to porous, and the best structure of the blend membrane was achieved when the PDMS: PVDF mass ratio was 1 : 5. Therefore, the membrane had the best separation performance in separating 15 wt. % ethanol aqueous solution with a permeate total flux of 273.65 g/(m2 h) and a separation factor of 9.09 when the mass ratio of PDMS: PVDF was 1 : 5.
Funder
Education Department of Jilin Province